Fiber for the Future

In our 60+ year history, it has always been our mission to provide the Cheyenne River Sioux Reservation with a modern and reliable communications infrastructure. Today, this includes approximately 1,500 miles of fiber optics reaching 20 communities and spread out over 2.8 million acres of land. This innovative technology offers our Reservation a platform to build and sustain self-sufficient and thriving communities.

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Numbers to Know

C.R.S.T. Telephone Authority will be closed on Monday, September 6, 2021 in observance of Labor Day.  We will resume our normal business hours on Tuesday, September 7th, 2021.

411 – Information
511 – Road Report
611 – CRSTTA Customer Service

711 – Telecommunication Relay Services
811 – Call Before You Dig
911 – Emergency


CRST Proud to Provide Scholarships

We value education for the youth in our service area and are…